title: Pressure-induced orthorhombic structure of PbS.
abstract: The pressure-induced crystal structure of lead sulfide (PbS) above 2.2 GPa has been studied with single-crystal x-ray diffraction in a diamond anvil cell at room temperature. It has been found to be twinned and of the TlI type (Cmcm, Z=4), in which the Pb atoms are surrounded by seven S atoms in a capped trigonal prism coordination. The twin laws in relation to the parent B1 (NaCl) type structure (Fm ̄3m, Z=4) at atmospheric pressure have been discussed.
authors.affiliation: Departamento de F´ısica de la Materia Condensada, Universidad del Pa´ıs Vasco, 48080 Bilbao, Spain. andrzej.grzechnik@ehu.es
authors.forename: Andrzej
authors.initials: A
authors.lastname: Grzechnik
authors.forename: Karen
authors.initials: K
authors.lastname: Friese